34 Chapter 1
Overview
Service Equipment You Will Need
Step Attenuator Loss Characterization
The step attenuator combination should have each attenuator setting characterized
by a metrology lab at 50 MHz. The following tables show which sections of the
10 dB and 1 dB step attenuators are utilized for each attenuator setting. The tables
also list the Allowable Uncertainty for each attenuator setting. The interconnect
cable should NEVER be disconnected once the loss characterization is performed.
b. Supported PSG models:
E8244A
E8254A
E8257C
E8257D
E8267C
E8267D
Note: One PSG with Option 567, 1EA, 1E1, 007, and UNX or UNR can be used as the Microwave Signal Generator #1, Low Noise
Signal Generator, and the RF Signal Generator.
c. The 8482A power sensor uses cal factors to compensate the power sensor for frequency response errors. Cal factors are stated in
percentages. The 8482A factory cal factor uncertainty ranges from 2.2% to 3.1%. The cal factor uncertainty can be reduced to
< 2.0% by using metrology grade calibration techniques. The power sensor cal factor uncertainty becomes one component of the
Verification Test uncertainty analysis. Lower cal factor uncertainties will translate to wider test margins.
d. The step attenuators should be permanently joined via the 11716A Interconnect Kit as shown in the diagram.
Table 1-2 1 dB Step Attenuator
Nominal Attenuation
(dB)
Attenuator Section Allowable Uncertainty
(dB)
#1
(1 dB)
#2
(2 dB)
#3
(4 dB)
#4
(4 dB)
0 Off Off Off Off 0 (Reference)
1 On Off Off Off < 0.005
2 Off On Off Off < 0.005
3 On On Off Off < 0.005
4 Off Off On Off < 0.005
5 On Off On Off < 0.005
6 Off On On Off < 0.005
7 On On On Off < 0.005
8 Off Off On On < 0.005
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